JP6764986B2 - Valve body removal device and valve body removal method - Google Patents

Description

The present invention relates to a valve body removing device and a valve body removing method for removing a valve body of a valve device connected to an existing fluid pipe in a continuous flow state.

Conventionally, a valve device such as a sluice valve is provided in an existing fluid pipe such as a water main, so that the fluid pipeline of the existing fluid pipe can be cut off. For example, in a sluice valve device, due to its structure, a valve body for shutting off the fluid pipeline, an operation shaft for operating the valve body, and the like, the valve body portion protrudes greatly with respect to the fluid pipeline. When the ability to shut off the fluid pipeline has decreased due to the endurance, or when the sluice valve device is no longer needed for the fluid pipeline, the entire sluice valve device is sealed with a work case to provide fluid. A valve that leaves the conduit for removing the sluice valve from the pipeline and placing a fluid pipe, for using the sluice valve only as a fluid pipeline, or for reuse as a sluice valve in the future. Removal work is being carried out, such as removing only the main body.

As a method of enclosing the entire sluice valve device with a work case and removing the valve body while leaving the pipeline portion, for example, a work case having a split structure is partitioned by sandwiching the sluice valve and the fluid pipeline in the vicinity of the sluice valve from the vertical direction. Some of them are watertightly mounted on the outer periphery of the fluid pipeline near the valve, and the valve body is removed from the pipeline in the work case by the attachment / detachment means of the valve body provided in the work case. (See, for example, Patent Documents 1 and 2).

Japanese Unexamined Patent Publication No. 2012-207719 (page 6, FIG. 6) Japanese Unexamined Patent Publication No. 2007-177945 (Page 6, Fig. 9)

However, in Patent Documents 1 and 2, the sluice valve device is sealed together with the fluid pipeline in the vicinity of the sluice valve device from the vertical direction by a work case formed by sandwiching the fluid pipeline into an upper part and a lower part. It is necessary to cover it like a shape. Therefore, it is necessary to excavate the buried ground until the sluice valve device and the fluid pipeline near the sluice valve device are exposed to secure a sufficient work space, and it takes a lot of time for excavation work and backfilling work. There is a problem of reduced efficiency.

The present invention has been made by paying attention to such a problem, and is a valve body removing device and a valve body removing method capable of reducing the time spent on excavation work and backfilling work and improving work efficiency. The purpose is to provide.

In order to solve the above problems, the valve body removing device of the present invention is used.
From a valve device including a pipeline main body that constitutes a pipeline constituent member together with a fluid pipe and a valve main body that is connected to the pipeline main body and can close the pipeline main body, the valve is in a non-disruptive state. In the valve body removal device for removing the main body
The valve body removing device includes a work case that encloses the valve body portion in a sealed state from the valve body portion to the connection portion between the pipeline portion body and the valve body portion, and at least the valve body portion in the work case. A valve moving means for moving the valve box portion constituting the valve device in the axial direction is provided.
The work case is a separate body from the work case, and is supported by a support device arranged so as to sandwich the valve main body portion from both sides by utilizing the upper side of the outer peripheral surface of the pipeline constituent member. It is characterized by being like this.
According to this feature, the work case is configured to be sealed from the valve main body to the connection portion between the pipeline main body and the valve main body, and is arranged on both sides of the valve main body. Since the work case is supported by the support device using the upper side of the outer peripheral surface of the pipeline constituent member, the valve body is in a continuous flow state only by excavating the buried ground to the extent that the upper side of the outer peripheral surface of the pipeline constituent member is exposed. Removal work can be carried out. Therefore, the time spent on excavation work and backfilling work is reduced, and work efficiency is improved.

The work case has a bottom surface having an opening that surrounds a flange located at the upper end of the main body of the pipeline portion from below, and the support device has a vertically extendable support portion that supports the work case. It is characterized by having.
According to this feature, the support device presses the bottom surface having the opening in the work case against the flange side located at the upper end of the main body of the pipeline portion by extending the support portion, and the work case is securely held by the support device and the flange. Can be retained.

The support device is characterized by having a curved support surface having substantially the same curvature as the pipe outer peripheral surface of the pipeline constituent member.
According to this feature, the outer peripheral surface of the pipeline constituent member and the curved support surface of the support device come into contact with each other over a large area, and not only does not give a local load to the pipeline constituent member, but also the installation position can be freely set. Can be set.

The working case has a plurality of divided structures that can be attached from the side of the valve device, and the support device has a support portion that supports all of the plurality of divided structures from below. It is characterized by.
According to this feature, since each of the divided structures is pushed up by the support portion, the divided structures do not shift even when an eccentric load is applied to the divided structures, and the sealing property is improved. Can be maintained.

The support device is arranged on the fluid pipe axis in the vicinity of a flange to which the pipeline component member is connected, and a contact portion is formed on a part of the support device to which a bolt for fastening the flanges can abut. It is characterized by being done.
According to this feature, since the support device is fixed to the flange connecting the pipeline constituent members on the fluid pipe axis by bolts, the support device can be reliably held when the work case is attached.

In order to solve the above problems, the valve body removing method of the present invention
From a valve device including a pipeline main body that constitutes a pipeline constituent member together with a fluid pipe and a valve main body that is connected to the pipeline main body and can close the pipeline main body, the valve is in a non-disruptive state. It is a valve body removal method for removing the main body,
A sealing step of enclosing the connection portion between the valve main body and the valve main body in a sealed state in the first split case.
A connection step of connecting the second division case on the first division case in a sealed manner, and
The first division case and the first division case are separated from the first division case by a support device arranged so as to sandwich the valve main body portion from both sides by utilizing the upper side of the outer peripheral surface of the pipeline constituent member. A support step for supporting the second split case is provided.
It is characterized in that at least a step of supporting the first division case by the support device is included before the connection step of connecting the second division case on the first division case.
According to this feature, the work case is supported by using the upper side of the outer peripheral surface of the pipeline constituent member by the support devices arranged on both sides of the valve body, so that the upper side of the outer peripheral surface of the pipeline constituent member is supported. The valve body removal work can be carried out in a continuous flow state only by excavating the buried ground to the extent that it is exposed. Therefore, the time spent on excavation work and backfilling work is reduced, work efficiency is improved, and the first split case and the second split case are not tilted during the valve body removal work, so that the valve body can be safely used. It can be removed.

FIG. 5 is a front view showing a state in which the buried ground is excavated until the upper parts of the fluid pipe, the sluice valve device, and the connecting pipe are exposed in the first embodiment. It is a front view which shows the state which the support device in Example 1 is placed on the upper side of the outer peripheral surface of a connection pipe. It is a side view which shows the support device in Example 1. FIG. FIG. 5 is a cross-sectional view taken along the line AA showing the support device according to the first embodiment. It is a front view which shows the state which supported the divided structure on the support device in Example 1. FIG. It is a top view which shows the divided structure. (A) is a side view showing a divided structure, and (b) is a side view showing one divided structure. It is a side view which shows the state which supported the divided structure on the support device in Example 1. FIG. It is a partial cross-sectional side view which shows the state which attached the work valve device to the divided structure. It is a partial cross-sectional side view which shows the state which supported the valve body removing device on the support device in Example 1. FIG. It is a partial cross-sectional side view which shows the state which the valve body part is removed by the valve body removing device. (A) is a side view showing the support device in the second embodiment, and (b) is also a front view. It is a front view which shows the state which the support device of Example 2 is placed on the upper side of the outer peripheral surface of a connection pipe. It is a side view which shows the state which the support device of Example 2 is placed on the upper side of the outer peripheral surface of a connection pipe. It is a side view which shows the support device in Example 3. FIG. It is a side view which shows the state which the support device of Example 3 is placed on the upper side of the outer peripheral surface of a connecting pipe. It is a front view which shows the state which the support device of Example 3 is placed on the upper side of the outer peripheral surface of a connection pipe.

A mode for carrying out the valve body removing device and the valve body removing method according to the present invention will be described below based on examples.

The valve body removing device and the valve body removing method according to the first embodiment will be described with reference to FIGS. 1 to 11. As shown in FIG. 1, in this embodiment, a sluice valve device 3 (valve device) capable of opening and closing the fluid pipeline is connected to the existing fluid pipes 2 and 2'. The fluid pipes 2 and 2'and the sluice valve device 3 are made of, for example, ductile cast iron for water supply buried in the ground, and the fluid pipes 2 and 2'are formed in a substantially circular shape in cross section and have an inner peripheral surface. Is covered with a mortar layer. The fluid pipe and valve device according to the present invention may be made of other metals such as cast iron and steel, or made of asbestos, concrete, vinyl chloride, polyethylene or polyolefin. Furthermore, the inner peripheral surface of the fluid pipe is not limited to the mortar layer, and may be coated with, for example, an epoxy resin, or an appropriate material may be coated on the inner peripheral surface of the fluid pipe by powder coating. Further, in this embodiment, the fluid in the fluid pipe is clean water, but it is not limited to the clean water of this embodiment, for example, industrial water, agricultural water, sewage, etc., as well as gas or a gas-liquid mixture of gas and liquid. It doesn't matter.

As shown in FIG. 1, the sluice valve device 3 is composed of a pipeline portion main body 11 and a valve main body portion 12. The pipeline main body 11 is projected in a direction different from the pipe axis of the pipe portion 13 with the pipe portion 13 communicating with the fluid pipes 2 and 2'and the flange portions 14 and 14' integrally formed with the pipe portion 13. It is composed of a tubular valve box portion 15 and a pipeline portion flange 16.

The valve body 12 includes a valve body 17 (see FIG. 11) capable of closing the pipeline main body 11, a valve lid flange 18, a valve lid 19 formed integrally with the valve lid flange 18, and a valve lid 19. It is composed of an operation unit 20 projecting from the upper surface to open and close the sluice valve device 3 from the outside, and the operation unit 20 is attached and detached via a packing (not shown) for sealing between the valve lid 19 and the valve lid 19. It is joined as possible. Further, the pipeline portion main body 11 and the valve main body portion 12 are connected to the bolts and nuts 60 via packings (not shown) for sealing the pipeline portion flange 16 and the valve lid flange 18 of the pipeline portion main body 11. It is detachably joined by.

Further, the sluice valve device 3 and the fluid pipes 2 and 2'are connected via connecting pipes 21 and 21'. The connecting pipes 21 and 21'have flange portions 22, 22'at one end in the longitudinal direction and receiving portions 23, 23'at the other end, respectively, and these flange portions 22, 22'and both ends of the sluice valve device 3 are provided. The flange portions 14, 14'are joined in a sealed manner via packing (not shown), and the flange portions are fastened to each other with bolts and nuts (not shown). The fluid pipes 2 and 2'are sealedly joined to the receiving portions 23 and 23'of the connecting pipes 21 and 21' by the push rings 24 and 24'fixed to the ends via packing (not shown). At the same time, the flanges are fastened with bolts and nuts (not shown). The fluid pipes 2 and 2', the pipe line main body 11 in the sluice valve device 3, the connecting pipes 21 and 21', and the push wheels 24 and 24' constitute the same fluid line, and in this embodiment, the same fluid line is formed. These are collectively defined as pipeline components. Further, in this embodiment, the members constituting the pipeline constituent members are joined by a flange, joined by a socket and an insertion port, and joined by using a push ring, but may be joined by welding or the like.

The valve body removing device and the valve body removing method in this embodiment are used, for example, at the time of replacement due to aging of the valve body 17 and deterioration of rubber. Hereinafter, the steps of removing the valve body 17 will be described in order. First, as shown in FIG. 1, the buried ground is excavated so that the upper side of the outer peripheral surface of the fluid pipes 2 and 2'is exposed to near the center. Subsequently, the bolts and nuts 60 for fastening the pipeline main body 11 and the valve main body 12 are replaced with the work bolts 25a, 25a, ... And the nuts 25b, 25b, ... Shown in FIG. 2, and the valve body removing device. The support devices 4, 4'consisting of 1 (see FIG. 10) are installed on the upper side of the outer peripheral surface of the pipeline portions 21a, 21a'in the connecting pipes 21 and 21'. The work bolts 25a, 25a, ... Are incorporated with packings for sealing the bolt holes (not shown) of the pipeline flange 16. The bolt holes of the pipeline flange 16 may be sealed with a seal washer instead of the packing.

As shown in FIGS. 3 and 4, each of the support devices 4 and 4'has a curved support surface 26a capable of surface contact with the outer peripheral surfaces of the pipeline portions 21a and 21a'in the connecting pipes 21 and 21'. A pair of support portions 27, 27'provided on the upper portion of the leg portion 26 and extending upwardly and contractably, and a pair of support portions 27, 27' are placed so as to be bridged between the support portions 27, 27'. It is mainly composed of a plate body 28 and.

As shown in FIGS. 3 and 4, each support portion 27 (27') has a columnar pedestal portion 29 formed on the upper portion of the leg portion 26 and a female screw (not shown) formed inside. , A height adjusting member 30 (30') formed with a male screw (not shown) screwed into a female screw (not shown), and connecting pipes 21 and 21'by the screwing back and forth of the height adjusting member 30. And, the distance from the plate body 28 placed on the support portion 27 can be adjusted.

Subsequently, as shown in FIGS. 5 and 8, a divided structure which is a first divided case forming a part of the working case 5 on the plates 28, 28'in the support devices 4, 4'. Place 31 and 32.

As will be described later, as shown in FIG. 10, the working case 5 is mainly composed of the divided structures 31 and 32, the fitting flange 49, the working valve device 50, the cylinder 52, and the upper lid 54. ing. As shown in FIGS. 6 and 7, a circular flange portion 44 is formed on the upper portions of the divided structures 31 and 32, and a work valve or the like described later can be attached. The divided structures 31 and 32 and the flange portion 44 are not limited to cylindrical shapes, and may be tubular members having a cross-sectional shape and a planar shape of substantially oval, substantially elliptical, and substantially square.

As shown in FIGS. 7 and 8, in the divided structures 31 and 32, plate-shaped projecting pieces 34 and 34 are formed at positions separated from the joint ends, respectively, and a plurality of the projecting pieces 34 and 34 are formed. Bolts 33a, 33a, ... Are inserted into the holes 34a, 34a, ... Provided, and these bolts 33a, 33a, ... And nuts 33b, 33b, ... Are fastened to the sluice valve device 3. It has a cylindrical shape that surrounds it.

Further, as shown in FIG. 6, arc-shaped notches 31b and notches 32b are formed on the bottom surfaces 31a and 32a of the divided structure 31 and the divided structure 32, respectively, and these notches 31b and 32b are formed. Consists of an opening 47 that surrounds the conduit portion flange 16 side of the valve box portion 15 in the sluice valve device 3. Further, work bolts 25a and 25a for fastening the valve lid flange 18 of the valve body 12 and the pipeline flange 16 of the pipeline body 11 to the split structure 31 and the bottom surfaces 31a and 32a of the split structure 32. , ... And a plurality of through holes 64, 64, ... Are formed at positions corresponding to the nuts 25b, 25b, .... The bottom surfaces 31a and 32a are flat and are continuously formed on the circumference, but the surface is not limited to this, and may be formed, for example, an uneven surface shape or intermittently.

A substantially semicircular sealing rubber 35 is fixed to the inner peripheral surface of the divided structure 31 along the outer peripheral surface shape of the pipeline flange 16, and similarly, the inner peripheral surface of the divided structure 32 is also fixed. , A substantially semicircular sealing rubber 35 is fixed along the outer peripheral surface shape of the pipeline flange 16, and the sealing rubbers 35, 35 are connected to the bolts 33a, 33a, ... And the nuts 33b, 33b, ... By tightening the divided structures 31 and 32 together, the ends thereof come into contact with each other in a sealed manner. As shown in FIG. 5, the sealing rubber 35 abuts over the side surface 16b of the pipeline flange 16, and although not shown, the sealing rubber 35 in the split structure 32 also abuts on the side surface 16b of the pipeline flange 16. The contact is made so as to prevent the fluid from leaking from the lower side of the divided structures 31 and 32. In addition, packings 36 and 36 are fixed to the joint surfaces of the divided structures 31 and 32 to improve the sealing property between the divided structures 31 and 32. By the sealing step as described above, the divided structures 31 and 32 are sealedly connected from the valve body portion 12 to the valve lid flange 18 and the pipeline portion flange 16 by tightening the divided structures 31 and 32 together. become. The sealing rubber 35 and the packing 36 may be integrally formed. Furthermore, the sealing rubber 35 is not limited to the one that abuts over the side surface 16b of the pipeline portion flange 16, and the fluid from the lower side of the divided structures 31 and 32 so as to surround a part of the pipeline portion main body 11. Leakage may be prevented.

Further, as shown in FIGS. 7A and 7B, a plurality of operating protrusions 40, 40, ... Protruding outward are formed on the lower side of the divided structures 31, 32. The operation protrusions 40, 40, ... Have a hollow structure penetrating into the divided structures 31, 32, and a female screw (not shown here) is formed on the inner peripheral surface of the hollow structure and can be operated from the outside. The flange lower portion fixing bolts 42, 42, ... Are screwed so that their tip portions 42a, 42a, ... Can protrude inside the split structures 31, 32. When the flange lower portion fixing bolts 42, 42, ... Are projected, the tip portions 42a, 42a, ... Can come into contact with the lower portion 16a of the pipeline portion flange 16, respectively. The flange lower fixing bolts 42, 42, ... May be screwed tightly to the divided structures 31, 32.

Further, on the lower side of the divided structures 31, 32, a plurality of operating protrusions 41, 41, ... Are formed at predetermined intervals upward from the operating protrusions 40, 40, ..., And the operating protrusions 40, 40, ... Similarly, the flange upper fixing bolts 43, 43, ... Are screwed to the inside of the divided structures 31, 32 in a hermetically sealed manner with respect to the divided structures 31, 32. When the flange upper fixing bolts 43, 43, ... Are projected, the tip portions 43a, 43a, ... Can come into contact with the upper portion 18a of the valve lid flange 18, respectively.

As shown in FIGS. 7B and 8, a jig 45 that is inserted into the working case 5 from the outside and can be operated from the outside is hermetically attached to the substantially center of the divided structure 31 in the vertical direction. Has been done. Further, as shown in FIGS. 7A and 8, confirmation windows 46, 46 are hermetically attached to the upper side of the divided structure 32. The confirmation windows 46, 46 are used when removing the packing remaining on the sealing surface of the pipeline flange 16 or cleaning the sealing surface after removing the valve body 12, or attaching the valve body after replacement. Used when. At this time, one of the confirmation windows 46 is used for the operator to directly visually check the inside, and the other is used as a light source. Subsequently, a method of attaching the split structures 31 and 32 to the sluice valve device 3 will be described. First, the height adjusting members 30, 30, ... Of the support devices 4, 4'placed on the upper side of the outer peripheral surface of the connecting pipes 21 and 21'are rotated to adjust the support devices 4, 4'to a predetermined height. To do.

Next, as shown in FIGS. 6 and 8, the pipeline portion flange 16 and the valve lid flange 18 are formed so that the notches 31b and 32b, that is, the opening 47 surrounds the pipeline portion flange 16 side of the valve box portion 15. The divided structures 31 and 32 surround the divided structures 31 and 32 from the side, and the protruding pieces 34 and 34 are fastened to each other by the bolts 33a, 33a, ... And the nuts 33b, 33b, .... At this time, the sealing rubbers 35, 35 are pressed against the side surface 16b of the pipeline flange 16, and the ends of the sealing rubbers 35, 35 are relatively pressed against each other, which is below the conduit flange 16. It is possible to prevent fluid from leaking from the side, that is, between the pipeline main body 11 and the opening 47. The sealing rubber 35 may surround not only the conduit flange 16 but also the outer periphery of the valve lid flange 18.

As shown in FIG. 8, in the divided structures 31, 32, the lower surfaces 34b, 34b of the projecting pieces 34, 34 are temporarily placed on the upper surfaces 28a, 28a of the plates 28, 28 of the support devices 4, 4'. The load is partially supported. Next, as shown in FIG. 5, a plurality of fixing screws 65, 65, ... Are formed through the through holes 64, with respect to the female screw portions (not shown) formed on the lower surfaces of the work bolts 25a, 25a, ... By screwing through 64, ..., The work bolts 25a, 25a, ... Are held by the divided structures 31, 32, and in this embodiment, the work bolts 25a, 25a, ... And the pipeline flange 16 The seal washer (not shown) interposed between them ensures the sealability.

As a method of holding the divided structures 31, 32 to the sluice valve device 3, the flange lower fixing bolts 42, 42, ... And the flange upper fixing bolts 43, 43, ... Are tightened and the tip portions 42a, 42a, respectively. ..., The tip portions 43a, 43a, ... Are brought into contact with the lower portion 16a of the pipeline portion flange 16 and the upper portion 18a of the valve lid flange 18 to sandwich the pipeline portion flange 16 and the valve lid flange 18, and the sluice valve device 3 Holds the divided structures 31 and 32.

Subsequently, the height adjusting members 30, 30, ... Of the support devices 4, 4'are further rotated, and the upper surfaces 28a, 28a of the plate bodies 28, 28 in the support devices 4, 4'are formed on the projecting pieces 34, 34. The heights of the support devices 4 and 4'are adjusted again so that the upper surfaces 28a and 28a of the plate bodies 28 and 28 are in contact with the lower surfaces 34b and 34b and are parallel to the legs 26.

The mounting steps of the divided structures 31 and 32 are not limited to the above-mentioned order. For example, the flange upper fixing bolts 43, 43, ... Are tightened in advance, and the tip portions 43a, 43a, ... Protruding into the split structures 31, 32 are supported by the upper portion 18a of the valve lid flange 18, and then. By arranging the support devices 4, 4', the above-mentioned procedure for temporarily placing the divided structures 31 and 32 on the support devices 4, 4'may be omitted.

Further, by rotating the height adjusting members 30, 30, ... Of the support devices 4, 4'while the divided structures 31, 32 are temporarily placed on the support devices 4, 4', the plate bodies 28, 28 are above. The divided structures 31 and 32 placed on the above may be raised to a predetermined position.

Further, prior to the step of readjusting the height adjusting members 30, 30, ..., The flange lower fixing bolts 42, 42, ... Or the flange upper fixing bolts 43, 43, ... Are tightened and the tip portion thereof is tightened. By projecting the tip portions 43a, 43a, ... Or the tip portions 43a, 43a, ..., The tip portions 42a, 42a, ..., Or the tip portions 43a, 43a, ... Are the lower portion 16a of the pipeline flange 16 or the valve lid flange 18. It is also possible to determine that the working case 5 is located at a predetermined height based on the contact with the upper portion 18a of the work case 5.

Next, as shown in FIG. 9, a step of connecting the second divided case in a sealed manner on the divided structures 31 and 32, which is the first divided case, is performed. The second split case is mainly composed of a fitting flange 49, a work valve device 50, a cylinder 52, and an upper lid 54, which will be described later. In this state, the work nuts 25b, 25b, ... Are removed, and the cap portion of the operation portion 20 provided on the upper portion of the valve lid 19 is removed, and instead, the valve suspension fitting 48 constituting the valve moving means is fixed. Further, a work valve device 50 provided with an openable / closable work valve 50c is connected to the upper portions of the flange portions 44, 44 of the divided structures 31 and 32 via the fitting flange 49. The work valve device 50 has flange portions 50a and 50b at the top and bottom, and the lower flange 50b is fixed to the flange portion 44 and the fitting flange 49 by using bolts and nuts (not shown).

Next, as shown in FIG. 10, the work valve device 50 and the cylinder 52 are fixed. The cylinder 52 has flange portions 52a and 52b at the top and bottom, and the lower flange 52b is fixed to the upper flange 50a of the work valve device 50 by using bolts and nuts (not shown). Next, the extension rod 53 constituting the valve moving means is attached to the valve suspension fitting 48, and the upper lid 54 through which the extension rod 53 can be inserted is attached to the upper flange 52a of the cylinder 52 in a sealed state. Then, the upper hanging metal fitting 55 constituting the valve moving means is fixed to the portion of the extension rod 53 exposed from the upper lid 54. Next, the cylinder 52 and the working valve device 50 are filled with fluid, and the inside of the cylinder 52 and the working valve device 50 is filled with fluid by the pressure pump 56. The fluid pressure test is performed by adjusting the pressure to be substantially the same as the fluid pressure in the main body 11, the connecting pipes 21 and 21', and the push wheels 24 and 24').

Next, as shown in FIG. 11, the flange upper fixing bolt 43, in a state where the pressure inside the cylinder 52 and the work valve device 50 and the inside of the pipeline component member are substantially the same, or when the pressure is once released, 43, ... Is regressed, the upper hanging bracket 55 and the extension rod 53 are pulled up, and the valve main body 12 is removed from the pipeline main body 11. After pulling up the valve body 12, the work valve 50c is closed. Then, although not described in detail here, the fluid in the cylinder 52 is discharged, the cylinder 52 is removed from the work valve device 50, and a new valve main body is attached to the pipeline main body 11. Further, when installing a new valve body, it is desirable to attach a weight (not shown) to the valve moving means to assist the insertion of the valve body. Further, in the final stage of insertion of the valve body, it is desirable to use the screw mechanism on the upper part of the upper lid 54 to insert the valve body against the fluid pressure.

As described above, the valve body removing device 1 has a structure in which the working case 5 surrounds the valve body, the valve body 12, the conduit flange 16 and the valve lid flange 18 in a sealed state, and the valve body. The working case 5 is supported by the support devices 4 and 4'arranged on both sides of the portion 12 by utilizing the upper side of the outer peripheral surface of the pipeline constituent member. Therefore, the valve body removal work can be performed in a continuous flow state only by excavating the buried ground to the extent that the upper side of the outer peripheral surface of the pipeline constituent member is exposed, reducing the time spent for excavation work and backfilling work, and working efficiency. Not only can the valve body be removed, but the work case 5 does not tilt during the valve body removal work, and the valve body can be safely removed. In addition, during the process of filling the cylinder 52 and the work valve device 50 with fluid and adjusting the inside of the cylinder 52 and the work valve device 50 to substantially the same pressure as the fluid pressure in the pipeline constituent member by the pressure pump 56. Even when a large pressure is applied to the work valve device 50, the work valve device 50 can be stably held.

Further, a small-diameter opening 47 that surrounds the pipeline portion flange 16 located at the upper end of the pipeline portion main body 11 from below is formed, and the support devices 4 and 4'are divided structures 31 that constitute the work case 5. Since the support devices 4, 4'have an extendable support portion 27, 27'that abuts on the lower surfaces 34b, 34 b of the projecting pieces 34, 34 of 32, the support devices 4, 4'have an opening due to the extension of the support portion 27, 27'. The bottom surfaces 31a, 32a of the divided structures 31, 32 having 47 are pressed against the work bolts 25a, 25a, ... Or the pipeline flange 16, and the support devices 4, 4'and the pipeline flange 16 are used for work. The divided structures 31 and 32 constituting the case 5 can be reliably held. The bottom surfaces 31a, 32a of the divided structures 31, 32 may be pressed against any of the working bolts 25a, 25a, ... And the pipeline flange 16. Furthermore, the step of pressing the bottom surfaces 31a, 32a of the divided structures 31, 32 having the openings 47 by the extension of the support portions 27, 27'to the working bolts 25a, 25a, ... And / or the pipeline flange 16 The purpose is to reinforce the fixing force between the valve device 3 and the split structures 31, 32 and the work case 5, and the load of the work case 5 can be supported by the support devices 4 and 4'. If so, this step may be omitted, and a gap may be formed between the bottom surfaces 31a, 32a of the divided structures 31, 32 and the work bolts 25a, 25a, ... And / or the pipeline flange 16. Absent.

Further, since the support devices 4 and 4'have a curved support surface 26a having substantially the same curvature as the outer peripheral surface of the connecting pipes 21 and 21'(pipeline constituent members), the support devices 4 and 4'are included in the pipeline constituent members. The upper side of the outer peripheral surface and the curved support surface 26a of the support devices 4 and 4'contact each other over a large area, so that not only a local load is not applied to the pipeline constituent members, but also the installation position can be freely set.

Further, since the support devices 4 and 4'push up the protruding pieces 34 and 34 of the divided structures 31 and 32 by the support portions 27 and 27', when an eccentric load is applied to the divided structures 31 and 32. In this case as well, the divided structures 31 and 32 do not shift, and the sealing property can be maintained in a high state.

Next, the valve body removing device and the valve body removing method according to the second embodiment will be described with reference to FIGS. 12 to 14. It should be noted that the description of the same configuration as that of the above embodiment and the overlapping configuration will be omitted.

As shown in FIGS. 12A and 12B, the support device 104 has a curved support surface 26a capable of surface contact with the outer peripheral surfaces of the pipeline portions 21a and 21a'in the connecting pipes 21 and 21'. A plate body 28 which is provided on the leg portion 126 and is provided on the upper portion of the leg portion 126 and is placed so as to be bridged between the support portions 27, 27'which extend upward and contractably and the support portions 27, 27'. It is mainly composed of and.

As shown in FIG. 12A, the leg portion 126 has curved contact surfaces 130 and 130' having a diameter smaller than that of the support surface 26a formed in the vicinity of both ends in the longitudinal direction of the support surface 26a.

As shown in FIG. 13, as a method of attaching the support devices 104 and 104'to the pipeline constituent members, first, the flanges 22 and 22'of the connecting pipes 21 and 21'and the flanges at both ends of the sluice valve device 3 are used. At least two bolts, nuts 70, 70, ... (See FIG. 14) for fastening the portions 14, 14'on the upper side are replaced with special bolts 131, 131'.

As shown in FIGS. 13 and 14, the special bolts 131, 131'have auxiliary support portions 131a, 131a' that are in surface contact with the contact surfaces 130, 130'in the support devices 104, 104'. In the support devices 104 and 104', the support surface 26a is placed on the upper side of the outer peripheral surface of the connecting pipes 21 and 21', and the contact surfaces 130 and 130' are placed on the auxiliary support portions 131a and 131a'. The contact surfaces 130 and 130'are the contact portions of this embodiment. According to this, since the support devices 104 and 104'are auxiliary supported so as to be rotationally restricted on the special bolts 131 and 131', the support devices are supported when the split structures 31 and 32 in the working case 5 are attached. The 104, 104'can be reliably held, and the operator does not need to hold the support devices 104, 104', and the work efficiency is high.

Next, the valve body removing device and the valve body removing method according to the third embodiment will be described with reference to FIGS. 15 to 17. It should be noted that the description of the same configuration as that of the above embodiment and the overlapping configuration will be omitted.

As shown in FIG. 15, the support device 204 includes a leg portion 226 having a curved support surface 26a capable of surface contact with the outer peripheral surfaces of the pipeline portions 21a and 21a'in the connecting pipes 21 and 21', and legs. It is mainly composed of a support portion 27, 27'provided on the upper portion of the portion 126 and extending upward and contractably, and a plate body 28 mounted so as to be bridged between the support portions 27, 27'. ing.

As shown in FIG. 15, the leg portion 226 has curved cutouts 132, 132 ′ having a diameter smaller than that of the support surface 26a formed in the vicinity of both ends in the longitudinal direction of the support surface 26a.

As shown in FIG. 16, as a method of attaching the support devices 204 and 204'to the pipeline constituent members, the support devices 204 and 204'place the support surface 26a on the upper side of the outer peripheral surface of the connecting pipes 21 and 21'. At least on the upper side of the bolts and nuts 70, 70, ... That fasten the flange portions 22, 22'of the connecting pipes 21 and 21'and the flange portions 14, 14' at both ends of the sluice valve device 3 in this state. Replace two of each with special bolts 133, 133'.

As shown in FIGS. 16 and 17, the special bolts 133, 133'are engaged with the notches 132, 132'in the support devices 204, 204', and the notches 132, 132' This is the contact portion of this embodiment. In the support devices 204 and 204', the support surface 26a is placed on the upper side of the outer peripheral surface of the connecting pipes 21 and 21', and the special bolts 133 and 133'are engaged with the notches 132 and 132'. According to this, since the support devices 204 and 204'are engaged with the special bolts 131 and 131' and are supported so as to regulate the vertical movement and the rotational movement, the divided structures 31 and 32 in the working case 5 are supported. The support devices 204 and 204'can be reliably held at the time of installation, and the operator does not need to hold the support devices 204 and 204', resulting in high work efficiency.

Although examples of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these examples, and any changes or additions within the scope of the gist of the present invention are included in the present invention. Is done.

For example, the valve body removing device 1 in this embodiment is not limited to the use of removing the valve body 12 in the sluice valve device, and its use is diverse, for example, from a butterfly valve, a switching valve, a ball valve, a plug, and the like. Not only can it be used for removing the valve body, but it can also be used when removing the lid from the pipeline body 11 sealed by the lid.

Further, the support devices 4 and 4'are not limited to the mode in which the support devices 4 and 4'are installed on the upper side of the outer peripheral surface of the connection pipes 21 and 21', for example, in the fluid pipes 2 and 2'constituting the pipeline constituent members and the sluice valve device 3. It may be installed on the upper side of the outer peripheral surface of the pipeline portion main body 11. Further, a plurality of three or more support devices 4 may be installed on the upper side of the outer peripheral surface of the pipeline constituent member.

Further, the support surface 26a of the support devices 4 and 4'is not limited to the surface shape that abuts on the upper side of the outer peripheral surface of the pipeline constituent member, as long as it is installed by utilizing the upper side of the outer peripheral surface of the pipeline constituent member. For example, it may have a concave-convex shape, or it may be configured to engage with the upper side of the outer peripheral surface of the pipeline constituent member.

Further, the support portions 27, 27'in the support devices 4, 4'are not limited to the screw type height adjusting mechanism as described above, and may be, for example, a hydraulic jack or the like. Further, two support portions 27 and 27'are provided in each support device 4, but the present invention is not limited to this, and each support device 4 may be provided with one or a plurality of three or more. Good.

Further, although the embodiment in which the support devices 4 and 4'and the work case 5 are separately configured has been described, the present invention is not limited to this, and for example, the support devices 4 and 4'are integrated with the work case 5. May be.

Further, the plate body 28 in the support devices 4 and 4'is not limited to the configuration in which the plate body 28 is placed on the support portions 27 and 27', for example, the support portions 27 and 27'are rotatable. May be engaged with'. Further, the plate body 28 is not limited to the integrated shape spanning the support portions 27, 27', and may be divided into a plurality of pieces.

Further, the divided structures 31 and 32 are not limited to the two divisions, and may be divided into a plurality of three or more.

Further, the support device has been described in a manner in which the lower surface of the work case is supported by a plate body, but the present invention is not limited to this. Etc. may be extended to support the load of the work case on the upper side of the outer peripheral surface of the pipeline constituent member. The arm may be provided on the work case side, or may be configured separately from the support device and the work case.

Further, in the above-described embodiment, the valve body removing device 1 is described in a mode in which the valve body main body is removed from the valve device such that the operation unit faces upward at the time of installation, but the present invention is not limited to this, and for example, installation. It can also be applied to a valve device in which the operation unit of the hour faces laterally.

1 Valve body removal device 2, 2'fluid pipe (pipeline component)
3 Gate valve device (valve device)
4, 4'Support device 5 Working case 11 Pipe line main body (pipe line component)
12 Valve body part 13 Pipe part 14, 14'Flange part 15 Valve box part 16 Pipe line part Flange 17 Valve body 18 Valve lid flange 19 Valve lid 21a, 21a' Pipe line part 21,21' Connection pipe (pipe line component member )
24, 24'Pushing wheel (pipeline component)
25, 25, ... Work bolts and nuts 26 Legs 26a Support surface 27, 27'Support 28 Plate 29 Pedestal 30, 30'Height adjustment member 31, 32 Split structure (first split case)
34, 34 Protruding pieces 35, 35 Sealing rubber 36, 36 Packing 42, 42, ... Flange lower fixing bolts 42a, 42a, ... Tip parts 43, 43, ... Flange upper fixing bolts 43a, 43a, ... Tip parts 44, 44 Flange Part 47 Opening 48 Valve hanging bracket (valve moving means)
49 Fitting flange (second split case)
50 Work valve device (second split case)
51 Work valve 52 Cylindrical (second split case)
53 Extension rod (valve moving means)
54 Top lid (second split case)
55 Upper hanging bracket (valve moving means)
104, 104'Support device 126,226 Leg 130,130' Abutment surface 131, 131' Special bolt 133, 133' Special bolt 204, 204' Support device

Claims (6)

From a valve device including a pipeline main body that constitutes a pipeline constituent member together with a fluid pipe and a valve main body that is connected to the pipeline main body and can close the pipeline main body, the valve is in a non-disruptive state. In the valve body removal device for removing the main body
The valve body removing device includes a work case that encloses the valve body portion from the valve body portion to the connection portion between the pipeline portion body and the valve body portion in a sealed state, and at least the valve body portion in the work case. A valve moving means for moving the valve box portion constituting the valve device in the axial direction is provided.
The work case is supported by a support device, and the support device is arranged on a fluid pipe axis in the vicinity of a flange to which the pipeline constituent member is connected, and is a part of the support device. A valve body removing device characterized in that a contact portion is formed so that bolts for fastening the flanges can come into contact with each other. The valve body removing device according to claim 1, wherein the support device has a vertically extendable support portion that supports the work case. The valve body removing device according to claim 1 or 2, wherein the support device has a curved support surface having substantially the same curvature as the pipe outer peripheral surface of the pipeline constituent member. The working case has a plurality of divided structures that can be attached from the side of the valve device, and the support device has a support portion that supports all of the plurality of divided structures from below. The valve body removing device according to any one of claims 1 to 3. The valve body removing device according to any one of claims 1 to 4, wherein a confirmation window is hermetically attached to the work case. From a valve device including a pipeline main body that constitutes a pipeline constituent member together with a fluid pipe and a valve main body that is connected to the pipeline main body and can close the pipeline main body, the valve is in a non-disruptive state. It is a valve body removal method for removing the main body,
A sealing step of enclosing the valve main body to the connecting portion between the pipeline main body and the valve main body in a sealed state in a first divided case having a plurality of divided structures.
A connection step of connecting the second division case on the first division case in a sealed manner, and
The first support device is arranged on the fluid pipe axis in the vicinity of the flange to which the pipeline constituent member is connected, and a contact portion is formed in a part where bolts for fastening the flanges can come into contact with each other. A support step for supporting the first split case and the second split case is provided.
A valve body including at least a step of supporting the first split case by the support device prior to a connecting step of connecting the second split case on the first split case in a sealed manner. How to remove.

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